Electrical plug and jack connection



Oct. 4, 1949. EASTQN 2,483,815

ELECTRICAL PLUG AND JACK CONNECTION Filed March 14, 1946 2 Sheeis-Sheetl -JET'g,J

INVENTOR.

Ger/lie Eaaoon.

ATTORNEYS.

Oct. 4, 1949. B. EASTON 2,483,815

ELECTRICAL PLUG AND JACK CONNECTION Filed March 14, 1946 2 Sheets-Sheet2 INVENTOR. I r! ar-796561400 BY ah, .\i@@/L= 76 7 /a4 ATTQRN;

Patented Oct. 4, 1949 UNITED STATES FATEN T OFFICE ELECTRICAL PLUG ANDJACK CONNECTION BertieEaston, Saginaw, Mich. Application March 14, 1946,Serial No. 654,294

a Claims. (01. 175-356) This invention relates. to improvements inelectrical plug and jack connections.

The primary object of this invention is. the pro.- vision of anelectrical connection of the plug and jack type adapted, to be used inconnection with microphones, headphones, permanent magnetic speakers,and as. a stepdown transformer in conventional lighting circuits; thesame, consisting of a simple plus and jack unit which is sealed againstmoisture, admission under varying conditions of pressure andtemperature.

A further object of this invention is. the provision of a connectorunit, of the above mentioned nature which consists of a transformerfree. of external corrodable parts connecting the various portionsthereof. I

A further object of this invention is the provision of a plug and jacktype of transformer unit, the parts of which may be, readily reached forcleaning purposes.

A further object of this invention is the provision of a flash-prooftype of, electrical connector of the transformer type.-,

A further object. of this invention is the provision of an; improvedtransformer construction having associated therewith a readily removablebattery arrangement. for rendering the assembly adaptable for microphoneuse.

A further object of this invention is the pro vision of an insulationmoisture proof plastic enclosed plug and jack transformer connector.

Other objects and advantages of. the invention will be apparent fromthe, following detailed de-- scription. V

In the accompanying drawings, forming a part of this specification, andwherein similar reference characters. designate corresponding partsthroughout the several views,

Figure 1 is a longitudinal sectional view showing the unit arranged formicrophone use.

Figure 2 is a sectional view taken through the improved unit showingthe. same arranged for use in connection with headphones, loud Speakersand a stepdown transformer in conventional lighting circuits,

Figure 3 is a transverse cross sectional View taken substantially on theline 33 of Figure 1.

Figure 4 is a fragmentary perspective view, partly in section, showingexploded positionsv of various par s of he; connector as. shown in Fiure 1.

Figure 5 is a transverse cross sectional view taken substantially on theline 5--5 of Figure2'.

F g 6 s a cross. sectional view similar to that sh n in ure 5,. b wi hthe plus; t an angle of 90 in the jack, for the purpose of inoperativelytails assembled as shown in Figure l for microphone use.

Figure 10 is an exploded view showing three of the relatively detachableparts of the connector.

Figure 11 is an enlarged fragmentary sectional View showing certaincontact portions of the device arranged as shown in Figure 1.

In the drawings, wherein for the purpose of illustration are showndifferent adaptations of the invention, the latter A may generallydesignate the assemblage shown in Figure 1, and B the assemblage shownin Figure 2. In each of these assemblages is provided an improved jackor socket construction C and a detachable plug construction D. They aresubstantially identical, except for the provision of a magneticallyoperated switch used in the form of invention shown in Figure 2, andwherever possible similar reference characters have been given to theseparts C and D. This magnetic switch arrangement used in connection withthe form of invention B is generally designated at E in Figure 2 andelsewhere,

and in the form of invention A a battery assemblage F is used when theimproved transformerconnector is utilized as part of a microphone setup.

Referring to the jack C, the same includes a plastic case structureconsisting of outer and inner cylindrical-shaped walls. 20 and 2|respectively having inner end walls 22 and 23 integrally connectedtherewith. The walls 22 and 23 are spaced. An outer end wall 25 connectsthe end of the cylindrical walls 20 and 2| intermediate the ends of thelatter; the said cylindricalshaped wall structure 2! outwardly beyondthe end wall 24 being externally screw threaded at 25 for receiving aring-shaped clamping nut 21, preferably also of plastic material. Thisnut 21 is provided with an annular flange at its inner end, designatedat 3.8, and is utilized for clamping the jack housing to a panelstructure 3i,

in the relation shown in Figure 1. If desired, some sealing composition32 may be employed to seal the connection of the ring-shaped nut 21 withthe panel. In other words, moisture cannot pass the panel through theconnection of the jack therewith. If desired, the wall 24 may bedetachably connected in a moisture sealed relation with the cylindricalbody portions 20 and 2|, so access may be had to the core and windingsin the jack unit. This is not shown and is a matter of mechanicalexpediency.

Within the compartment between the cylindrical walls 20 and 2| and theend walls 22 and 23 there is positioned a laminated substantiallyC-shaped core 35 receiving therein a winding 38, ordinarily the primarywinding, located between the inner edges of the laminations and aroundthe cylindrical wall 2|, as shown in the drawings. This winding 36 iscylindrical-shaped, as shown, and well understood.

Referring now to the construction of the transformer assemblage as shownin Figure 2, which is adaptable for headphone, loud speaker and generalhousing wiring lighting circuits used, the plug unit D preferablyconsists of a cylindricalshaped plastic case body 40 having an end wall4| defining a compartment wherein is received a T-shaped core 42 havinga cylindrically arranged secondary winding 44 thereon.

The core portions and windings of the plug and jack are, of course,complementary so far as transformer construction is concerned, and theT-shaped formation of the plug core is laminated also.

In connection with use of the assemblage with headphones, loud speakersand as a stepdown transformer in conventional lighting circuits, thecasing structure 40 is extended through the external sleeve portion 25of the jack casing and has a preferably integral cap 50 thereon; the caphaving a socket adapted to receive the ringshaped nut 21; the externalportion of the nut 21 and the inner periphery of the cap being providedwith a thread connection 60 which will admit of full connection of theseparts with a quarter turn or less. The arrangement may consist ofinterrupted screw threads if so desired, but it is intended that a firmconnection of the cap upon the nut shall be effected with but a quarterdegree turn.

A washer BI may seal the connection of the cap with the portions 25 and21. While the cap is shown as integral with the cylinder extension ofthe plug casing, a sealed detachable connection could be provided ifdesired.

It is my intention to provide a single pole throw switch arrangement forenergizing or deenergizing the coil. This consists of the assemblage Eshown in Figure 2 and includes a switch arm I pivoted at II upon aninsulation block I2 within the compartment of the jack forwardly of thewinding. A stationary contact I3 is also mounted upon the block 12.Normally the switch arm I0 is spring or otherwise actuated to open thecircuit through the winding 36, since these contacts have connectiontherewith.

Within the extension of the plug casing 40 there is positioned apermanent bar magnet 80 in the same plane as the armature of the switchE and when the cap 50 is in clamped position upon the nut 21 the barmagnet 8!] is in line with the armature I0 and will, of course, draw thesame into circuit closing position. When the cap 50 is given a quarterturn the switch arm will return to open the circuit. I prefer to providea non- 4 magnetic brass insert 8| between the bar magnet and thelaminated core 42.

The cap 50 carries the lead wires 84 which have connection with thesecondary winding 44.

With reference to Figure 3 it will be noted that various terminals 85are provided for connection to suitable leads for the purpose of givingproper impedance to the plate current of audio amplifier output tube orgrid circuit of an input stage.

Referring to the assemblage A as shown in Figure 1 where a batteryassemblage F is used with the transformer plug and jack, as formicrophone use, the cap 50 which corresponds to the cap 50 of the formof invention B, is integral with the extended casing portion 40 and hasa connection 60 admitting of the plug being connected to the nut 21 by aquarter turn movement. The casin portion 40 of the jack unit is,however, extended at 90, as shown in Figure 1 and externally screwthreaded at 92 for receiving a detachabl plastic cap 04. The compartment95 provided in the outer end of the casing structure 40 receives a drycell battery 96 having a central outer end contact 91.

A plastic insulation cup-shaped insert 98 is located in the casing 40immediately at the outer end of the coil 42 and it has a contact I00connected to one of the wires leading to the winding 44. This contactI00 has a sprin arm I00 which engages the casing of the battery 96 andgrounds the battery in the circuit of the secondary winding. The centralouter end contact 91 of the battery is connected in circuit with thelead wire I02 attached to the outer end of the cap 94 by means of aspring urged terminal contact I04 which is retained within an insulationdisctype insert I05 in the outer end of the cap 94, as shown in Figure1.

The'other wire I01 leads from the secondary winding along the casing 40in a secured relation and is attached to a contact ring IIO mounted uponan insulation washer III located in a countersunk seat within the outerend of the extension of the plug casing. This washer is movable in theseat and normally urged outward by a resilient wavy type of compressionring II2, best shown in Figure 4. The insulation ring or disc I05 has acontact ring I I5 on the inner end thereof adapted to seat against thering IIO to establish contact with the other lead wire IIB carried bythe cap.

It will be apparent, from the foregoing that a relatively simple type ofseal plug and jack transformer assemblage has been provided which iswater-proof, shock-proof and flash-proof and can be used for a largevariet of purposes. For instance, its flash-proof ability will enable itto be used in mining installations or Where explosive gases or chemicalsare stored or utilized.

It is to be understood that all parts of the casing, as well as insertstructures in the drawings will be fabricated of plastic or otherapproved insulation which has a low moisture absorption rate over a longperiod of time.

I wish it to be understood that the magnet switch arrangement shown inFigure 2 is not essential to operation of the device.

Various changes in the shape, size and arrangement of parts may be madeto the form of invention herein shown and described, Without departingfrom the spirit of the invention or the scope of the following claims.

I claim:

'1. In a transformer type connecter the combination of complementarytelescopin jack and plug sections, means to detachably connect them upona support against relative axial movement, and complementaryinterfitting laminated core and windings in each of said jack and plugsections completely insulated respectively therein against moistureaccess thereto.

2. In a transformer type connecter unit the combination of a pair ofcomplementary telescoping casings of insulation material each defining ahermetically sealed compartment, complementary laminated core andwindings hermetically sealed in each of said compartments, and means todetachably connect said casings with the cores and windings in operativerelation to each other.

3. In a moisture, flash and shock-proof electrical connector unit, thecombination of a jack casing of insulation material having ahermetically-sealed compartment, and providing an inner end wall, anouter end wall, a side wal1 joining said end walls and asocket-providing wall structure, including a third end Wall, adjacent toand spaced from said inner end wall and substantially paralleling saidinner end wall, and an inner side wall joining said third end wall andextending to said outer end wall, said third end Wall and said innerside wall defining a socket opening at said outer end wall; a core andwinding in said com- REFERENCES CITED The following references are ofrecord in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,505,325 Elbert Aug. 19, 19241,657,002 Cragg Jan. 24, 1928 1,657,840 Nelson Jan. 31, 1928 1,935,169Williams Nov. 14, 1933 1,964,265 Markley June 26, 1934 2,176,064 Cole eta1, Oct. 17, 1939 2,283,942 Morris May 26, 1942 2,413,201 Tillman Dec.24, 1946

